/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/MeshMaterialFunctions.h
Resets all Material IDs on a mesh to the given ClearValue, or 0 if no ClearValue is provided. If Material IDs are not already enabled on the Target Mesh, this function will first enable them and then set the value.
static [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * ClearMaterialIDs ( [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * TargetMesh, int ClearValue, [UGeometryScriptDebug](API\Plugins\GeometryScriptingCore\GeometryScript\UGeometryScriptDebug) * Debug )